کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1637159 1516962 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamics for chemical vapor synthesis of Nb nanopowder in NbCl5-H2-Ar system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Thermodynamics for chemical vapor synthesis of Nb nanopowder in NbCl5-H2-Ar system
چکیده انگلیسی
Thermodynamics for chemical vapor synthesis (CVS) of Nb nanopowder in NbCl5-H2-Ar system was investigated by using FactSage software. The validation experiments were conducted to confirm the thermodynamics points. The results indicate that under the atmospheric pressure, the reduction approach from NbCl5(g) to Nb(s) is a stage-wise process with the formation of complex sub-chlorides, and is controllable at low hydrogen ratio (mole ratio of n(NbCl5):n(H2)<1:180) and low temperature (<1050 °C). Furthermore, a reasonable amount of inert loading gas is favorable to increase the reduction ratio of NbCl5 and the powder yield. The as-synthesized Nb nanopowder with the homogeneous size of 30-50 nm and the powder yield of 85% (mass fraction) is obtained by the CVS process under n(NbCl5):n(H2):n(Ar)=1:120:1 and 950 °C with the NbCl5 reduction rate of 96.1%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 24, Issue 12, December 2014, Pages 3987-3993
نویسندگان
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